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The team of 33 researchers drawn from centres across the world also said governments needed to look at ways to make physical activity more convenient, affordable and safer.

It is recommended that adults do 150 minutes of moderate exercise, such as brisk walking, cycling or gardening, each week.

The Lancet study found people in higher income countries were the least active with those in the UK among the worst, as nearly two-thirds of adults were judged not to be doing enough.Continue reading the main storyCase study

From Monday to Saturday, the streets of the Colombian capital of Bogota are packed with cars.

The city - one of the largest in South America - is a teeming metropolis, home to more than seven million people.

But on a Sunday vehicles are nowhere to be seen. Instead, the streets are taken over by pedestrians and cyclists, thanks to Ciclovia, a traffic-free streets initiative run by the city authorities.

The scheme, backed by successive mayors, has been running in one guise or another since the mid-1970s.

It now covers nearly 100km of roads in the centre of the city on Sundays and public holidays.

But as well as making Bogota a quieter place to roam, the ban on cars also has a health benefit.

Research has shown about a million residents regularly walk around on a Sunday, a fifth of whom say they would be inactive if it were not for the ban on vehicles.

Dr Michael Pratt, who was involved in the Lancet research on physical inactivity, said the Bogota scheme was a "wonderful example" of how governments could be encouraging more exercise.Sedentary lifestyle can kill

The researchers admitted comparisons between countries were difficult because the way activity was estimated may have differed from place to place.

Nonetheless, they said they remained confident that their overall conclusion was valid.

Pedro Hallal, one of the lead researchers, said: "With the upcoming 2012 Olympic Games, sport and physical activity will attract tremendous worldwide attention.

"Although the world will be watching elite athletes from many countries compete in sporting events... most spectators will be quite inactive.

"The global challenge is clear - make physical activity a public health priority throughout the world to improve health and reduce the burden of disease."

Prof Lindsey Davies, president of the UK Faculty of Public Health, agreed.

"We need to do all we can to make it easy for people to look after their health and get active as part of their daily lives," she said.

"Our environment has a significant part to play. For example, people who feel unsafe in their local park will be less likely to use it."

But others questioned equating smoking with inactivity.

While smoking and inactivity kill a similar number of people, smoking rates are much lower than the number of inactive people, making smoking more risky to the individual.

Dr Claire Knight, of Cancer Research UK, said: "When it comes to preventing cancer, stopping smoking is by far the most important thing you can do."
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